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標題: | 巴克紙複合電極材料之製備及其於超級電容器之應用 Fabrication of Buckypaper Composites for Supercapacitor Electrodes |
作者: | Yen-Li Su 蘇晏立 |
指導教授: | 楊燿州 |
關鍵字: | 巴克紙,石墨烯,固態超級電容,奈米碳管,PVA, MWCNT,solid-state supercapacitor,Buckypaper,graphene nanoplatelets,gel polymer electrolyte, |
出版年 : | 2012 |
學位: | 碩士 |
摘要: | 在本研究中,我們利用奈米碳管材料製作巴克紙(Buckypaper)應用於固態超級電容器,藉由摻雜不同比例之石墨烯(Graphene)材料於巴克紙中,能夠有效提升超級電容單位面積儲存的電容量。巴克紙是由奈米碳管所構成,我們使用真空過濾法,過濾完全分散之奈米碳管溶液,將奈米碳管沉積在濾紙上,形成碳管互相緊密糾結之多孔性結構層,藉由碳管奈米尺度所提供的高表面積,提高超級電容之電容量。在本研究中,我們發現添加石墨烯材料,可降低奈米碳管網路結構的密度,而使巴克紙結構較原本鬆散,能夠增加材料與電解質的接觸面積,能有效大幅提高材料單位面積下,所能儲存的電容量。而本研究所製備單純奈米碳管之巴克紙擁有最高56.4 mF/cm2 (51.27 F/g),經添加20%石墨烯後,最高比電容量達103.43 mF/cm2 (41.37 F/g)。本研究採用PVA-KOH作為固態鹼性電解質,能夠使超級電容具有較高的工作電壓,同時簡化封裝時滲漏的問題,易於發展做為撓性超級電容。本研究亦探討不同KOH溶液濃度對其離子導電性之影響,實驗結果顯示於濃度9M時,具有最佳離子導電度0.013 S/cm。此外,我們也整合製作超級電容器陣列系統,用來驅動LED發光二極體,並成功使其發光超過40秒。 In this work, we present a solid-state supercapacitors by using mutil-walled carbon-nanotube (MWCNT) buckypapers. The graphene nanoplatelets are introduced into MWCNT buckypaper for increasing the areal capacitance of the supercapcitor. The buckypaper is fabricated by filtering the dispersed carbon nanotubes suspension through a Nylon membrane. The porous structure layer with high surface area of nano-scale carbon nanotube network can effectively increase capacitance of the supercapacitor. The structure density of the carbon nanotubes network can be decreased by introducing the graphene nanoplatelets. Therefore, contact area between active materials and electrolyte is increased, which in turn makes the capacitance of the capacitor higher than original pure MWCNT buckypaper. The maximum specific capacitance of the pure MWCNT buckpaper and 20%-graphene buckpaper are 56.4 mF/cm2 (51.27 F/g) and 103.43 mF/cm2 (41.37 F/g), respectively. The PVA-KOH, which is prepared by a solution-casting method, is used as the electrolyte material in the solid-state supercapacitor. The advantages of the solid-state supercapacitor include higher working voltage, easy packaging, and structure flexibility. The concentration of KOH is an important parameter of the ionic conductance in the device. In our experiment, the best ionic conductivity is 0.013 S/cm with 9M KOH. We also demonstrated that an supercapacitor array which consists three supercapacitors can turn on an LED for 40 seconds |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/64544 |
全文授權: | 有償授權 |
顯示於系所單位: | 機械工程學系 |
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